Carl h



(No Model.)

' G. H. LANDGRAF.-

WATGHMAKERS POISING TOOL.

No. 529,178. Patented Nov. 13, 1894.

'IIII INVENTOH 4M z gm flax I WITNESSES: MW de. W

A TTOHNEY.

mimsvou.

m: norms PETERS o0, PHOTO-Limo WAS NITED STATES PATENT FFICEQ CARL H.LANDGRAF, OF. NEW YORK, N. Y., ASSIGNOR 'I O HENRY ZIMMERN & CO., OFSAME PLACE.

WATCHMAKERS POISING-TOOL.

SPECIFICATION forming part of Letters Patent No. 529,178, dated November13, 1894.

Application filed June 1, 1894. Serial No. 513,119. (No model.)

To all whom it may concern.-

3e it known thatI, CARL H. LANDGRAF, a cltizen of the United States, anda resident of New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Poising-Tools forWatchmakers, of which the following is a specification.

My invention relates to an improvement in polsln g tools for watchmakers, and more partlcularly to tools ordevices used by watch makersfor truing the balance wheel of a watch movement, the object of theinvention being to provide an article of this kind which shall be simpleand cheap to construct, and

' effective in use, and by means of which the slightest deviation in thepoise or balance of the wheel may be detected, and with these and otherends in view, my invention consists in certain novel features ofconstruction and combinations of parts as will be hereinafter fullydescribed and pointed out in the claims.

In the accompanying drawings Figure 1 is a wow 1n perspective of apoising tool constructed in accordance with my invention. Fig. 2 is atop plan view thereof. Fig.3 is a bottom plan view thereof. Fig. 4 is asect1onal view taken on the line 4-4 of Fig. 2. Fig. 5 is a sectionalview taken through one of the legs or standards.

Referring to the drawingsA represents the bed plate or table of thedevice, preferably constructed of a circular piece of metal. Formed onor secured to the under side of this circular disk are three pins a ontowhich latter are threaded the legs or standard a, by means of which thesupport. or bed plate may be lengthened or shortened at will, in orderto allow of the unevenness, or possible slant, of the work bench ortable, and admit of the disk A being brought to a true level.

On the upper surface of the disk A and near the outer edge thereof arepivoted the two arms B, said arms being pivoted upon opposite sides ofthe center of said disk, and at points equally distant therefrom. Theinner free ends of these arms B are curved or bent upwardly as shown atb, and have formed thereon or secured thereto the supports 0, preferablyprovided. with knife edges 12' as shown in Fig. at to prevent as muchfriction as possible when the balance wheel is supported and revolvedthereon.

It will be understood that by pivoting the arms B at equally distantpoints and upon opposite sides of the center of the disk A, the supportsC will always remain parallel when caused to travel toward or away fromeach other, if moved simultaneously and over the same extent of surface.In order to operate these supports I pivot to the under side or surfaceof the plate A and concentrically therewith a disk D, provided with thelever or handle cl, and with elongated slots cl on opposite sides of thecenter of said disk and 6 5 parallel with each other. In the disk A arealso formed the slots a curved in opposite directions and upon oppositesides of the center, through which slots 0, and d are passed the pins orscrews 0, the latter being also passed through the inner or free end ofthe arms B.

It will be understood from the above description that upon turning thelever or handle d the pins 0 are caused to simultaneously 7 5 traveltoward or away from the center of the disk A, this movement being alsoimparted to the supports 0 through the medium of the arms 13, saidsupports consequently moving toward or away from each other in parallel8o planes. In practice these supports 0 are adjusted to within theproper distance of each other in order to allow the extreme ends of theshaft of the balance wheel E (Fig. 4:) to rest on the knife edgesthereof, and by 8 5 slightly revolving said wheel E the perfect balancethereof may be determined and effected, as will be readily understood bythose skilled in the art.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a poising tool the combination with the table or support A, of theadjustable supports 0 adapted to move toward or from each other inparallel planes,a disk D provided with a handle or lever and indirectlyconnected with said supports 0, substantially as described.

2. In a poising tool the combination with 1 the disk A, of the arms Bpivoted to said disk A and upon opposite sides and equally dissaid disk,a disk D provided with a handle or lever and pins passing throughsaidarms B and through slots formed in said disks A and B, substantiallyas described.

Signed at New York, in the county of New [5 York and State of New York,this 24Eth day of May, A. D. 1894.

CARL H. LANDGRAF.

Witnesses:

M. J. LAMPERT, GEORGE COOK.

